Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold

Takeshi Fujita, Tomoharu Tokunaga, Ling Zhang, Dongwei Li, Luyang Chen, Shigeo Arai, Yuta Yamamoto, Akihiko Hirata, Nobuo Tanaka, Yi Ding, Mingwei Chen

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71 Citations (Scopus)

Abstract

Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.

Original languageEnglish
Pages (from-to)1172-1177
Number of pages6
JournalNano Letters
Volume14
Issue number3
DOIs
Publication statusPublished - 2014 Mar 12
Externally publishedYes

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Keywords

  • CO oxidation
  • environmental transmission electron microscopy
  • heterogeneous catalyst
  • In situ TEM
  • nanoporous metal

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Fujita, T., Tokunaga, T., Zhang, L., Li, D., Chen, L., Arai, S., Yamamoto, Y., Hirata, A., Tanaka, N., Ding, Y., & Chen, M. (2014). Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. Nano Letters, 14(3), 1172-1177. https://doi.org/10.1021/nl403895s